Genuine video files do not have double extensions like .mkv.mp4 . This naming convention is a common trick used to hide the true file type from users who have "Hide extensions for known file types" enabled in Windows. Why this is suspicious:

: If you are looking for the show Willow (2022), it is an official Disney+ original series. Stick to official streaming platforms or verified, well-known community trackers to avoid security risks. Willow.S01E04.720p.WEB.h264-KOGi.mkv.mp4

It is almost certainly an executable (.exe) or a script disguised as a video. Delete it immediately if you have already downloaded it. Genuine video files do not have double extensions like